Apple also has the most high-risk holes with 64 reported in OS X, and is just nudged out by Linux in the medium-severity stakes which clocked 74 flaws to iOS' 72.

Windows platforms were far behind with 68 total reported bugs and 20 medium-severity flaws reported. Surveyed Windows releases included Windows 8, 8.1, 7, Vista, and RT, along with Server 2012 and 2008. All had between 30 and 38 vulnerabilities.

Crucially, up to 80 percent of the reported bugs concerned third party applications, and only 13 percent related to the operating systems in question.

Stats tallier and hacker Cristian Florian says he grouped the various Linux flavours into single categories because it was difficult to parse affected distributions as the kernel can be independently upgraded. Here's how he explains himself:

“The operating systems are different and it is hard to group them in a way that everybody agrees with. For example, unlike Windows, the Linux Kernel can be upgraded independently of the rest of the operating system; therefore it is hard to link Linux Kernel vulnerabilities to a specific Linux distribution or Linux distribution version. This is why Linux vulnerabilities are grouped under Linux Kernel as a separate product and then there are the specific vulnerabilities for each Linux distribution. The reason why only Linux Kernel and Apple OS X are listed at the top is because the number of vulnerabilities that specifically apply to other Linux distributions (like Red Hat, Debian, etc.) is lower than the number of vulnerabilities that apply to the operating systems already listed.

Florian says the total pool of reported vulnerabilities rose by 2,244, up almost 50 percent on the previous year, GFI says.

That bumper year was tough on Linux which endured some of 2014's most critical security issues including Heartbleed and ShellShock that impact Linux apps.

The don't-try-this-at-home surf tool also blew away the competition with 220 high severity holes reported to the Choc Factory's 86, and Fox's 57.

Safari came in with 70 total reported holes of which only three were high-severity.

The statistics do not place one operating system above another in the security stakes, or suggest that Windows is more secure than Linux, but merely indicate the attention paid to bug discovery and subsequent reporting. ®